While working on JDK-8305825, I saw intermittent failures of open/test/jdk/java/awt/KeyboardFocusmanager/ConsumeNextMnemonicKeyTypedTest/ConsumeNextMnemonicKeyTypedTest.java:


----------System.out:(1/50)----------
Test: character typed after mnemonic key press: i
----------System.err:(14/827)----------
Test: character typed with VK_A: a
java.lang.RuntimeException: Test failed!
at ConsumeNextMnemonicKeyTypedTest.test(ConsumeNextMnemonicKeyTypedTest.java:142)
at ConsumeNextMnemonicKeyTypedTest.start(ConsumeNextMnemonicKeyTypedTest.java:77)
at ConsumeNextMnemonicKeyTypedTest.main(ConsumeNextMnemonicKeyTypedTest.java:51)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
at com.sun.javatest.regtest.agent.MainWrapper$MainTask.run(MainWrapper.java:138)
at java.base/java.lang.Thread.run(Thread.java:1570)

JavaTest Message: Test threw exception: java.lang.RuntimeException: Test failed!


It is also reproducible with jdk 11, 17, 19, 22.
If you run it with the test(); line commented, you can reproduce it with human input.

A reproducer is attached(modified test to repeat Alt+F, i presses in a loop, can be run directly with java ConsumeNextMnemonicKeyTypedTest.java).